Electric motor for brakes.



No. 630,205. Patented Aug. I, I899. R. A. J. EVANS.

ELECTRIC MOTOR FOB BRAKES.

(Application filed Feb. 8, 1899.)

(N6 Modal.)

Z/ of 2v A TTOHNEYS.

ATENT OFFICE.

RICHARD ALFRED JOHN EVANS, OF CHICAGO, ILLINOIS.

ELECTRIC MOTOR FOR BRAKES.

SlfEGIFIGATION forming part of Letters Patent No. 630,205, dated August1, 1899.

Application filed February 8,1899. Serial No. 704,908. (No model.)

elevated; and the object is to provide a brake-' operating motor ofsimple construction and by means of which a great pressure may be exerted upon the brake by a comparatively small amount of electric currentpassing through the motor.

I will describe an electric motor for brakes embodying my invention andthen point out the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding partsin all the views.

Figure 1 is an elevation of a brake embodying my invention and showingits casing in section. Fig. 2 is a section on the line 2 2 of Fig. 1,and Fig. 3 is an end view of the invention.

The motor comprises field-pieces 1 2, extended upward from field-magnets3 4t and connected at their top with a brass yoke or plate 5, and thelower ends of these fieldpieces are connected to an iron plate 6. Havinga bearing in the yoke 5 and also having a bearing through the plate 6 isthe armatureshaft 7, on which the armature 8 is mounted. This armature 8has its ends 9 10 extended outward and made in hook form or curved toconform, substantially, to the circular construction of thefield-pieces, and these hook portions, of course, will be at all timeswithin the lines of force of the field-pieces 1 and 2. Thearmature-windings 11 and 12 are connected in series, and one end hasaconnection 13 with a binding-post 14:, with which a conductor 15connects. These windings also have a connection 16 with the field-magnet3, which is connected in series with the magnet 4, and this magnet 4 hasa connection 17 with a binding-post 18, with which a conductor 19engages.

The whole device is to be connected to the under side of a car, and thecurrent may be controlled by the niotormau operating a device in theusual resistance-box. The sides and ends are suitably inclosed by endpieces 20 and side pieces 21, one of these side pieces 21 being hinged,so that it may be swung open to inspect or repairthe motor whennecessary.

To the lowerend of the armature-shaft 7 is keyed a brake-operating lever22, one end of which is to be connected to the brake mechanism in asuitable manner, which it is not deemed necessary to herein show. Theother end of the lever 22 has pivotal connection with a rod 23, mountedto slide in an opening formed in the downwardly-extended portion of abracket 24:, attached to a portion of the motor-casin g, and arrangedbetween the said downwardlyextended portion of the bracket and the headportion 25 of the rod 23 is a coiled spring 26, designed to move thelever and the armature to a normal or open position when the electriccircuit is opened.

In operation when it is desired to set the brakes the circuitis to beclosed, causing the fields to attract or draw the armature, which, itwill be seen, has a horizontal rocking motion. The hook extensions 9 and10 of the armature will of course be drawn tightly against thefield-pieces 1 and 2 at opposite sides, and therefore the field-piecesact as stops for the armature. This movement of the armature will rockthe lever 22 to set the brake, and at the same time the spring 26 willbe compressed, so that upon shutting off the current the said spring maymove the parts to their normal position, as before mentioned.

Having thus described my invention, I claim as new and desire to secureby Letters Patent-- 1. An electric motor for brakes, comprising twofield-pieces, field-magnets thereon, an armature shaft arranged betweenthe field-magnets, an armature mounted on said shaft having projectingcurved ends partly surrounding and mechanically engaging thefield-pieces when a current is closed through the armature and field,the said armature having its windings connected in series and alsoconnected in the field-magnets, and a brake-actuating lever attached tothe armature-shaft, substantially as specified.

2. An electric motor for brakes, comprising upwardly-extendedfield-pieces connected with a yoke or plate, field-magnets on saidfield-pieces and supported on a plate, an armature-shaft having bearingsin the yoke and through said plate, an armature secured to the shaft andhaving curved ends for partly surrounding and mechanically engaging withthe field-pieces at opposite sides, windings on the armature connectedin series with the field-magnets, a brake-actuating lever connected tothe armature-shaft, and means for moving said lever when the current isclosed from the motor, substantially as specified.

3. An electric motor for brakes, compris ing field-pieces, field-magnetsthereon, a yoke or plate to which the upper ends of the fieldpieces areconnected, an armature-shaft arranged between the field-pieces andmounted to rock, an armature secured to said shaft and having itsprojected ends concaved to conform substantially to the contour of thefield-pieces, a lever having connection with the lower end of thearmature-shaft, a rod having pivotal connection with one end of saidlever, a bracket through which said rod is movable, and a springarranged around said rod for moving the lever in one direction when themotor is denergized, substantially as specified.

4. A motor, comprising field-magnets, fieldpieces extended therefrom, anarmatureshaft, and an armature on said shaft and having its windingsconnected to the fieldmagnets, the projected ends of said armature beingcurved to partially surround and mechanically engage the field-pieces,substantially as specified.

5. A brake-motor, comprising field-pieces, field-magnets on thefield-pieces, and an armature having curved ends adapted to partiallysurround and to mechanically engage with the field-pieces, substantiallyas specified.

RICHARD ALFRED JOHN EVANS.

.WVitnesses:

GEO. STRAKEY, ROBERT EVANS.

